In short
Turn an existing strong article into a cluster by mining its own comments, related searches, and People Also Ask boxes for sub-questions it doesn't fully answer, writing focused articles for the highest-value ones, and linking each new piece back to the original.
You don't need to start from zero
If you already have one comprehensive, well-performing article on a topic, you have a pillar page — you may just not have built the cluster around it yet. This is often the fastest path to real topical authority, because the hard part (writing something comprehensive enough to anchor a cluster) is already done.
Finding the sub-questions your pillar doesn't fully answer
Search your own pillar page's target keyword and read the "People Also Ask" questions — any that your pillar only touches briefly, or doesn't address at all, are candidates for a dedicated supporting article. Also check Search Console's Performance report for your pillar's URL: queries with impressions but low clicks often reveal a related question people search for but don't find fully answered on the page.
Mining your own content for natural sub-topics
Re-read your pillar page's own headings — each ## section is often a candidate to become its own deep-dive article, especially any section you found yourself wanting to write more about but kept brief to avoid bloating the pillar. This is usually the richest and easiest source of cluster ideas, since the topic connection is already established by definition.
Prioritizing what to write first
Not every possible sub-question deserves its own article — prioritize the ones with genuine search demand (check via the free methods in how to do keyword research without expensive tools) and the ones your pillar currently handles most thinly. Writing three focused, high-value supporting articles beats writing ten thin ones for the sake of hitting a number.
Linking the cluster together as you build it
As each new supporting article publishes, add a link to it from the relevant section of the pillar page, and add a link back to the pillar from the new article's introduction or conclusion. Don't wait until the whole cluster is "done" to add these links — link each piece in as soon as it's live, so the cluster's value compounds from the first supporting article onward rather than all at once at the end.
Updating the pillar as the cluster grows
Periodically revisit the pillar page itself and check whether its brief mentions of now-covered sub-topics should link out to the dedicated articles, and whether the pillar's own content needs updating to reflect what the cluster has taught you about the topic since it was first written.
A realistic starting scope
If you're starting a cluster from one existing pillar, three to five well-chosen supporting articles is a reasonable, achievable first phase — enough to demonstrate real depth without an overwhelming production commitment. Expand from there based on what continues to show genuine search demand.
Keep reading: The Topic Cluster Playbook: Building Authority Search Engines Trust.
Common questions
How do I find sub-topics for a cluster if I only have one article?
Mine the article's own section headings for topics you touched briefly, check People Also Ask for the pillar's target keyword, and review Search Console for related queries with impressions but low click-through.
Do I need to publish all supporting articles at once?
No — link each one into the pillar and back as soon as it's published; the cluster's value builds incrementally rather than requiring a simultaneous launch.
How many supporting articles make a real cluster?
There's no strict minimum, but three to five well-chosen ones is a reasonable, realistic starting scope that demonstrates genuine depth without overcommitting.